멀티 에이전트(Multi-agent) AI 시스템 가이드 2026 — 싱글 에이전트와 차이·도입 사례·외주 비용

As Korean companies adopt multi-agent systems beyond simple chatbots in 2026, this guide provides the critical decision framework and cost transparency previously missing—showing when 90% quality improvements justify 15x token cost increases, and when single-agent suffices. Real Korean case studies prove ROI in compliance, e-commerce, and R&D domains while enabling procurement teams to validate vendor proposals.